I have ony experenced eyesight correction by using dr schutzes eyebright tincture. I have used dr christophers and did not get the same results. Being a vegan for several years did not make a difference in my eyesight either. I perosnally believe through personal experence with using herbs is that they give the body the building nutrients that are lacking in even the best diets in order for the body to repair itself. I have improved my eyes 1 point bilaterally after doing juice facting detox tea and washing my eyes 5x daily.